Doping and grain size effects in nanocrystalline ZrO₂–Sc₂O₃system with complex phase transitions: XRD and Raman studies

Retention at room temperature of the tetragonal t″-form in Sc2O3-doped ZrO2 nanopowders

“…Differently, the characterization of the phase diagram of nanostructured ZrO 2 -Sc 2 O 3 solid solutions did not receive much attention up to now. To our knowledge, only Xu et al [3] have explored some features of the ZrO 2 -Sc 2 O 3 phase diagram in nanostructured solid solutions. These authors studied the phase transitions in ZrO 2 -Sc 2 O 3 nanopowders synthesized by a two step hydrothermal process.…”

Rheological behavior, molecular structure of precursor and evolution mechanism: zirconia fibers from polyaceticzirconium precursors

“…3E g ) and the Raman spectrum of cubic zirconia only contains a mode (F 2g ) [30,31]. In the Raman spectrum of the zirconia fibers, six Raman bands at 150, 262, 325, 470, 615 and 640 cm -1 are observed and can be ascribed to tetragonal phase [32][33][34][35]. The respective assignments of the Raman vibrational modes are 150 cm -1 (E g ), 262 cm -1 (A 1g ), 325 cm -1 (B 1g ), 470 cm -1 (E g ), 615 cm -1 (B 1g ) and 640 cm -1 (E g ) [36].…”

Influence of the urea content on the YSZ hydrothermal synthesis under dilute conditions and its role as dispersant agent in the post-reaction medium

“…Some researchers have reported the hydrothermal conditions required for synthesizing nanoparticles stabilized zirconia under mild conditions. 12,[19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] For instance, the characteristics of the scandia-stabilized zirconia powders, such as, crystalline size, crystalline phase, particle size distribution, degree of agglomeration and strength of the agglomerates synthesized, are controlled by the pH at the end of the reaction, ion concentration and salts used as starting reagents, pressure, volume, temperature and time, i.e. thermal treatment.…”